Bug#661556: include/{SDL,GL} missing from debian/copyright

[Ansgar Burchardt]

Package: src:spring
Version: 85.0+dfsg1-2
Severity: important

The files in include/{SDL,GL} are missing from debian/copyright.  They
were removed from the Git repository, but are still present in the
upstream tarball (and thus also when the source package is extracted
such as on buildds).

Please either document them or also remove them from the upstream
tarball.

Regards,
Ansgar